Alt Ref NoBMSS/612
TitleAtgofion am sefydliad Cymdeithas Amddiffynol y Chwarelwyr (neu Undeb y Chwarelwyr) gan R.O. Williams
DateMai 1874
AdminHistoryRoedd R.O. Williams o Greuor, Llanrug, sir Gaernarfon yn Ysgrifennydd cyntaf i'r undeb
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